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Oct 28, 2014
10/14

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Hemond, Peter J.; Suter, Kelly J.

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This article is from Journal of Visualized Experiments : JoVE . Abstract Gonadotropin-Releasing Hormone (GnRH) is a small neuropeptide that regulates pituitary release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). These gonadotropins are essential for the regulation of reproductive function. The GnRH-containing neurons are distributed diffusely throughout the hypothalamus and project to the median eminence where they release GnRH from their axon terminals into the...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3143065

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Oct 25, 2014
10/14

by
Kwon, Ronald Y; Meays, Diana R; Tang, W Joyce; Frangos, John A

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This article is from Journal of Bone and Mineral Research , volume 25 . Abstract Interstitial fluid flow (IFF) has been widely hypothesized to mediate skeletal adaptation to mechanical loading. Although a large body of in vitro evidence has demonstrated that fluid flow stimulates osteogenic and antiresorptive responses in bone cells, there is much less in vivo evidence that IFF mediates loading-induced skeletal adaptation. This is due in large part to the challenges associated with decoupling...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3153350

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Oct 28, 2014
10/14

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Dean, Emma; El-Helw, Loaie; Hasan, Jurjees

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This article is from Cancers , volume 2 . Abstract Molecularly targeted therapy is relatively new to ovarian cancer despite the unquestionable success with these agents in other solid tumours such as breast and colorectal cancer. Advanced ovarian cancer is chemosensitive and patients can survive several years on treatment. However chemotherapy diminishes in efficacy over time whilst toxicities persist. Newer biological agents that target explicit molecular pathways and lack specific...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3827593

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Oct 25, 2014
10/14

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Diez-Perez, Adolfo; Guerri, Roberto; Nogues, Xavier; Caceres, Enric; Pena, Maria Jesus; Mellibovsky, Leonardo; Randall, Connor; Bridges, Daniel; Weaver, James C; Proctor, Alexander; Brimer, Davis; Koester, Kurt J; Ritchie, Robert O; Hansma, Paul K

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This article is from Journal of Bone and Mineral Research , volume 25 . Abstract Bone tissue mechanical properties are deemed a key component of bone strength, but their assessment requires invasive procedures. Here we validate a new instrument, a reference point indentation (RPI) instrument, for measuring these tissue properties in vivo. The RPI instrument performs bone microindentation testing (BMT) by inserting a probe assembly through the skin covering the tibia and, after displacing...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3153354

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Oct 26, 2014
10/14

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Munoz-Jordan, Jorge L.; Fredericksen, Brenda L.

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This article is from Viruses , volume 2 . Abstract The flavivirus genus includes viruses with a remarkable ability to produce disease on a large scale. The expansion and increased endemicity of dengue and West Nile viruses in the Americas exemplifies their medical and epidemiological importance. The rapid detection of viral infection and induction of the innate antiviral response are crucial to determining the outcome of infection. The intracellular pathogen receptors RIG-I and MDA5 play a...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3185611

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Sep 20, 2013
09/13

by
D. J. J. Farnell

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Recent developments of high-order CCM have been to extend existing formalism and codes to $s \ge \frac 12$ for both the ground and excited states, and independently to "generalised" expectation values for a wide range of one- and two-body spin operators. An advantage of the CCM is that the Goldstone linked-cluster theorem is obeyed at all levels of approximation and so it provides results in the infinite lattice limit $N \to \infty$ from the outset. However, recent results have also...

Source: http://arxiv.org/abs/1002.4396v1

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Sep 20, 2013
09/13

by
Patrick Crotty; Daniel Schult; Ken Segall

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With the goal of understanding the intricate behavior and dynamics of collections of neurons, we present superconducting circuits containing Josephson junctions that model biologically realistic neurons. These "Josephson junction neurons" reproduce many characteristic behaviors of biological neurons such as action potentials, refractory periods, and firing thresholds. They can be coupled together in ways that mimic electrical and chemical synapses. Using existing fabrication...

Source: http://arxiv.org/abs/1002.2892v2

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Sep 20, 2013
09/13

by
Amarjit Budhiraja; Paul Dupuis; Vasileios Maroulas

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A large deviation principle is established for a general class of stochastic flows in the small noise limit. This result is then applied to a Bayesian formulation of an image matching problem, and an approximate maximum likelihood property is shown for the solution of an optimization problem involving the large deviations rate function.

Source: http://arxiv.org/abs/1002.4295v1

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Sep 20, 2013
09/13

by
Bo Wang; Zhengwei Liu; Yunkun Han; Zhenxin Lei; Yangping Luo; Zhanwen Han

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Type Ia supernovae (SNe Ia) play an important role in diverse areas of astrophysics, from the chemical evolution of galaxies to observational cosmology. However, the nature of the progenitors of SNe Ia is still unclear. In this paper, according to a detailed binary population synthesis study, we obtained SN Ia birthrates and delay times from different progenitor models, and compared them with observations. We find that the Galactic SN Ia birthrate from the double-degenerate (DD) model is close...

Source: http://arxiv.org/abs/1002.4229v1

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Sep 20, 2013
09/13

by
M. H. Zare; Mohsen Amini; Farhad Shahbazi; S. A. Jafari

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Employing the Kernel Polynomial method (KPM), we study the electronic properties of the graphene bilayers in the presence of diagonal disorder, within the tight-binding approximation. The KPM method enables us to calculate local density of states (LDOS) without need to exactly diagonalize the Hamiltonian. We use the geometrical averaging of the LDOS's at different lattice sites as a criterion to distinguish the localized states from extended ones. We find that bilayer graphene undergoes...

Source: http://arxiv.org/abs/1002.4306v1

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Sep 18, 2013
09/13

by
Colin Ingalls; Madeeha Khalid

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Let X be a K3 surface of degree 8 in P^5 with hyperplane section H. We associate to it another K3 surface M which is a double cover of P^2 ramified on a sextic curve C. In the generic case when X is smooth and a complete intersection of three quadrics, there is a natural correspondence between M and the moduli space M' of rank two vector bundles on X with Chern classes c_1=H and c_2=4. We build on previous work of Mukai and others, giving conditions and examples where M' is fine, compact,...

Source: http://arxiv.org/abs/0803.0179v3

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Sep 20, 2013
09/13

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Christian TomĂˇs Schmiegelow; Miguel Antonio Larotonda; Juan Pablo Paz

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We present the results of the first photonic implementation of a new method for quantum process tomography. The method (originally presented by A. Bendersky et al, Phys. Rev. Lett 100, 190403 (2008)) enables the estimation of any element of the chi-matrix that characterizes a quantum process using resources that scale polynomially with the number of qubits. It is based on the idea of mapping the estimation of any chi-matrix element onto the average fidelity of a quantum channel and estimating...

Source: http://arxiv.org/abs/1002.4436v1

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Sep 20, 2013
09/13

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Y. Iida; T. Yokoyama; K. Ichimoto

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A cancellation is thought to be a basic process of the photospheric magnetic field and plays an important role in magnetic flux budget and in various solar activities. There are two major theoretical scenarios for this phenomena, i.e. the "U-loop emergence" and the Omega-loop submergence models. It is important to clarify which is the dominant process during the cancellation for the estimation of the solar magnetic flux transport through the surface. We study the vector magnetic field...

Source: http://arxiv.org/abs/1002.4274v1

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Sep 20, 2013
09/13

by
T. Szalai; L. L. Kiss; G. E. Sarty

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LS 5039 is a relatively close microquasar consisting of a late O-type star and a compact object (very possibly a black hole) on a highly eccentric orbit with a period of 3.9 days. The high X-ray, gamma-ray and radio luminosity indicate light-matter interaction, which arise from the stellar wind of the primary star accreting toward the black hole. Former examinations suggest that LS 5039 could be a prototype of wind-fed high mass X-ray binaries (WXBs) with diskless main sequence O primaries. Now...

Source: http://arxiv.org/abs/1002.4402v1

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Sep 19, 2013
09/13

by
Arvind Ayyer

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We construct a direct natural bijection between descending plane partitions without any special part and permutations. The directness is in the sense that the bijection avoids any reference to nonintersecting lattice paths. The advantage of the bijection is that it provides an interpretation for the seemingly long list of conditions needed to define descending plane partitions. Unfortunately, the bijection does not relate the number of parts of the descending plane partition with the number of...

Source: http://arxiv.org/abs/0909.4732v2

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Sep 20, 2013
09/13

by
Tye Lidman

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Ozsvath and Szabo construct a spectral sequence with E_2 term \Lambda^*(H^1(Y;Z))\otimes Z[U,U^{-1}] converging to HF^\infty(Y,s) for a torsion Spin^c structure s. They conjecture that the differentials are completely determined by the integral triple cup product form via a proposed formula. In this paper, we prove that HF^\infty(Y,s) is in fact determined by the integral cohomology ring when s is torsion. Furthermore, for torsion Spin^c structures, we give a complete calculation of HF^\infty...

Source: http://arxiv.org/abs/1002.4389v1

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Sep 19, 2013
09/13

by
Ru-Fen Liu; Ching Cheng

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We use density functional theory based first-principles methods to study the magnetism in a 2D hexagonal BN sheet induced by the different concentrations of oxygen and silicon atoms substituting for nitrogen (O$_\mathrm{N}$) and boron (Si$_\mathrm{B}$) respectively. We demonstrate the possible formation of three distinct phases based on the magnetization energy calculated self-consistently for the ferromagnetic (ME$_{\mathrm{FM}}$) and antiferromagnetic (ME$_{\mathrm{AFM}}$) states, i.e. the...

Source: http://arxiv.org/abs/0909.4924v2

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Sep 22, 2013
09/13

by
Peter Petersen; Frederick Wilhelm

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We describe a few abstract principles that are used in the deformation of the Gromoll-Meyer metric to positive curvature.

Source: http://arxiv.org/abs/0908.3026v2

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Sep 20, 2013
09/13

by
Lih-King Lim; Achilleas Lazarides; Andreas Hemmerich; C. Morais Smith

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We study superconductivity in an ultracold Bose-Fermi mixture loaded into a square optical lattice subjected to a staggered flux. While the bosons form a superfluid at very low temperature and weak interaction, the interacting fermions experience an additional long-ranged attractive interaction mediated by phonons in the bosonic superfluid. This leads us to consider a generalized Hubbard model with on-site and nearest-neighbor attractive interactions, which give rise to two competing...

Source: http://arxiv.org/abs/1002.4423v1

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Sep 20, 2013
09/13

by
C. Sandin; T. Becker; M. M. Roth; J. Gerssen; A. Monreal-Ibero; P. BĂ¶hm; P. Weilbacher

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The reduction of integral-field spectrograph (IFS) data is demanding work. Many repetitive operations are required in order to convert raw data into, typically a large number of, spectra. This effort can be markedly simplified through the use of a tool or pipeline, which is designed to complete many of the repetitive operations without human interaction. Here we present our semi-automatic data-reduction tool p3d that is designed to be used with fiber-fed IFSs. Important components of p3d...

Source: http://arxiv.org/abs/1002.4406v1

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Sep 20, 2013
09/13

by
Y. Guo; B. Schmieder; V. Bommier; S. Gosain

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The main objective of this paper is to build and compare vector magnetic maps obtained by two spectral polarimeters, i.e. THEMIS/MTR and Hinode SOT/SP, using two inversion codes (UNNOFIT and MELANIE) based on the Milne-Eddington solar atmosphere model. To this end, we used observations of a facular region within active region NOAA 10996 on 23 May 2008, and found consistent results concerning the field strength, azimuth and inclination distributions. Because SOT/SP is free from the seeing effect...

Source: http://arxiv.org/abs/1002.4355v1

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Sep 20, 2013
09/13

by
Saif Khan Mohammed; Emanuele Viterbo; Yi Hong; Ananthanarayanan Chockalingam

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We consider Gaussian multiple-input multiple-output (MIMO) channels with discrete input alphabets. We propose a non-diagonal precoder based on the X-Codes in \cite{Xcodes_paper} to increase the mutual information. The MIMO channel is transformed into a set of parallel subchannels using Singular Value Decomposition (SVD) and X-Codes are then used to pair the subchannels. X-Codes are fully characterized by the pairings and a $2\times 2$ real rotation matrix for each pair (parameterized with a...

Source: http://arxiv.org/abs/1002.4263v1

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Sep 20, 2013
09/13

by
Samrat Dey; Yatendra S. Jain

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Wave mechanics of a particle in an impenetrable spherical cavity with and without a hard core scattering potential of size $\epsilon$ ($\epsilon$ $\to$ 0) at its center is critically analyzed. It makes marginal but important modifications in our present understanding of the energy eigenvalues of such particles.

Source: http://arxiv.org/abs/1002.4308v1

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Sep 20, 2013
09/13

by
Antonio Diaz Ramos

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We describe the projectives in the category of functors from a graded poset to abelian groups. Based on this description we define a related condition, pseudo-projectivity, and we prove that this condition is enough for the vanishing of the derived direct limits. We apply this result to deduce a generalized version of a theorem of Whitehead for the pushout. The dual results for inverse limits are also considered. We present two methods to compute integral cohomology of posets, a local one a and...

Source: http://arxiv.org/abs/1002.4312v1

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Sep 23, 2013
09/13

by
Heng Guo; Ji-Rong Ren

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By making use of Duan-Ge's decomposition theory of gauge potential and the Duan's topological current theory proposed by Prof. Duan Yi-Shi, we study a two component superfluid Bose condensed system, which is supposed being realized in the interior of neutron stars in the form of a coexistent neutron superfluid and protonic superconductor. We propose that this system possesses vortex lines. The topological charge of the vortex lines are characterized by the Hopf indices and the Brower degrees of...

Source: http://arxiv.org/abs/0903.0092v2

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Sep 21, 2013
09/13

by
Hayato Motohashi; Alexei A. Starobinsky; Jun'ichi Yokoyama

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For a class of viable cosmological models in $f(R)$ gravity which deviation from the Einstein gravity decreases as a inverse power law of the Ricci scalar $R$ for large $R$, an analytic solution for density perturbations in the matter component during the matter dominated stage is obtained in terms of hypergeometric functions. An analytical expression for the matter transfer function at scales much less than the present Hubble scale is also obtained.

Source: http://arxiv.org/abs/0905.0730v3

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Sep 21, 2013
09/13

by
Luca Grisa; Lorenzo Sorbo

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We derive the Hamiltonian describing Pauli-Fierz massive gravitons on a flat Friedmann-Robertson-Walker (FRW) cosmology in a particular, non-generic effective field theory. The cosmological evolution is driven by a scalar field Phi with an arbitrary potential V(Phi). The model contains two coupled scalar modes, corresponding to the fluctuations of Phi and to the propagating scalar component of the Pauli-Fierz graviton. In order to preserve the full gauge invariance of the massless version of...

Source: http://arxiv.org/abs/0905.3391v2

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Sep 20, 2013
09/13

by
V. S. Rabinovich; S. Roch

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Let $\Gamma$ be a finitely generated discrete exact group. We consider operators on $l^2(\Gamma)$ which are composed by operators of multiplication by a function in $l^\infty (\Gamma)$ and by the operators of left-shift by elements of $\Gamma$. These operators generate a $C^*$-subalgebra of $L(l^2(\Gamma))$ the elements of which we call band-dominated operators on $\Gamma$. We study the stability of the finite sections method for band-dominated operators with respect to a given generating...

Source: http://arxiv.org/abs/1002.4258v1

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Sep 22, 2013
09/13

by
Birgit Hausmann; Mughees Khan; Tom Babinec; Yinan Zhang; Katie Martinick; Murray McCutcheon; Phil Hemmer; Marko Loncar

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We present a design and a top-down fabrication method for realizing diamond nanowires in both bulk single crystal and polycrystalline diamond. Numerical modeling was used to study coupling between a Nitrogen Vacancy (NV) color center and optical modes of a nanowire, and to find an optimal range of nanowire diameters that allows for large collection efficiency of emitted photons. Inductively coupled plasma (ICP) reactive ion etching (RIE) with oxygen is used to fabricate the nanowires....

Source: http://arxiv.org/abs/0908.0352v2

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Sep 20, 2013
09/13

by
D. R. Mizuno; K. E. Kraemer; N. Flagey; N. Billot; S. Shenoy; R. Paladini; E. Ryan; A. Noriega-Crespo; S. J. Carey; .

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We present a catalog of 416 extended, resolved, disk- and ring-like objects as detected in the MIPSGAL 24 micron survey of the Galactic plane. This catalog is the result of a search in the MIPSGAL image data for generally circularly symmetric, extended "bubbles" without prior knowledge or expectation of their physical nature. Most of the objects have no extended counterpart at 8 or 70 micron, with less than 20% detections at each wavelength. For the 54 objects with central point...

Source: http://arxiv.org/abs/1002.4421v1

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Jul 22, 2013
07/13

by
Toshio Nakatsu; Kanehisa Takasaki

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This is a review of the authors' recent results on an integrable structure of the melting crystal model with external potentials. The partition function of this model is a sum over all plane partitions (3D Young diagrams). By the method of transfer matrices, this sum turns into a sum over ordinary partitions (Young diagrams), which may be thought of as a model of q -deformed random partitions. This model can be further translated to the language of a complex fermion system. A fermionic...

Source: http://arxiv.org/abs/0807.4970v4

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Sep 20, 2013
09/13

by
Holger Mueller; Jian Jin; Radostin Danev; John Spence; Howard Padmore; Robert M. Glaeser

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We propose a Zernike phase contrast electron microscope that uses an intense laser focus to convert a phase image into a visible image. We present the relativistic quantum theory of the phase shift caused by the laser-electron-interaction, study resonant cavities for enhancing the laser intensity, and discuss applications in biology, soft materials science, and atomic and molecular physics.

Source: http://arxiv.org/abs/1002.4237v1

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Sep 20, 2013
09/13

by
Kefeng Tan; Jianrong Shi; Gang Zhao

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The non-local thermodynamic equilibrium (NLTE) line formation of neutral boron in the atmospheres of cool stars are investigated. Our results confirm that NLTE effects for the B I resonance lines, which are due to a combination of overionization and optical pumping effects, are most important for hot, metalpoor, and low-gravity stars; however, the amplitude of departures from LTE found by this work are smaller than that of previous studies. In addition, our calculation shows that the line...

Source: http://arxiv.org/abs/1002.4412v1

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Sep 20, 2013
09/13

by
Wilfrid S. Kendall

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We exhibit some explicit co-adapted couplings for n-dimensional Brownian motion and all its Levy stochastic areas. In the two-dimensional case we show how to derive exact asymptotics for the coupling time under various mixed coupling strategies, using Dufresne's formula for the distribution of exponential functionals of Brownian motion. This yields quantitative asymptotics for the distributions of random times required for certain simultaneous couplings of stochastic area and Brownian motion....

Source: http://arxiv.org/abs/1002.4348v1

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Sep 20, 2013
09/13

by
S. Giraud; R. Combescot

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Very recently Girardeau and Minguzzi [arXiv:0807.3366v2, Phys. Rev. A 79, 033610 (2009)] have studied an impurity in a one-dimensional gas of hard-core bosons. In particular they deal with the general case where the mass of the impurity is different from the mass of the bosons and the impurity-boson interaction is not necessarily infinitely repulsive. We show that one of their initial step is erroneous, contradicting both physical intuition and known exact results. Their results in the general...

Source: http://arxiv.org/abs/1002.4366v1

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Sep 20, 2013
09/13

by
X. L. Wang; M. Y. Ni; Z. Zeng

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Electronic and magnetic properties of VnBzn+1 sandwich clusters are investigated using density functional theory. Growth model is applied to investigate the property change of Vanadium-Benzene sandwich clusters. Our results show that, for n

Source: http://arxiv.org/abs/1002.4323v1

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Sep 20, 2013
09/13

by
Giuseppe NisticĂ˛; Angela Sestito

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We prove that by adopting a strict interpretation of the Einstein-Podolsky-Rosen criterion of reality, the proofs of the known non-locality theorems fail in showing that quantum mechanics violates the principle of locality and reality.

Source: http://arxiv.org/abs/1002.0715v2

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Sep 20, 2013
09/13

by
Tom Bridgeland

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We use Joyce's theory of motivic Hall algebras to prove that reduced Donaldson-Thomas curve-counting invariants on Calabi-Yau threefolds coincide with stable pair invariants, and that the generating functions for these invariants are Laurent expansions of rational functions.

Source: http://arxiv.org/abs/1002.4374v1

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Sep 20, 2013
09/13

by
E. M. de Gouveia Dal Pino; G. Kowal; L. H. S. Kadowaki; P. Piovezan; A. Lazarian

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One of the fundamental properties of astrophysical magnetic fields is their ability to change topology through reconnection and in doing so, to release magnetic energy, sometimes violently. In this work, we review recent results on the role of magnetic reconnection and associated heating and particle acceleration in jet/accretion disk systems, namely young stellar objects (YSOs), microquasars, and active galactic nuclei (AGNs).

Source: http://arxiv.org/abs/1002.4434v1

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Sep 20, 2013
09/13

by
T. K. Jha; H. Mishra; V. Sreekanth

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We consider a rotating neutron star with the presence of hyperons in its core, using an equation of state in an effective chiral model within the relativistic mean field approximation. We calculate the hyperonic bulk viscosity coefficient due to nonleptonic weak interactions. By estimating the damping timescales of the dissipative processes, we investigate its role in the suppression of gravitationally driven instabilities in the $r$-mode. We observe that $r$-mode instability remains very much...

Source: http://arxiv.org/abs/1002.4253v1

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Sep 20, 2013
09/13

by
Anwar Bhatti; Don Lincoln

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Jets have been used to verify the theory of quantum chromodynamics (QCD), measure the structure of the proton and to search for the physics beyond the Standard Model. In this article, we review the current status of jet physics at the Tevatron, a sqrt(s) = 1.96 TeV p-pbar collider at the Fermi National Accelerator Laboratory. We report on recent measurements of the inclusive jet production cross section and the results of searches for physics beyond the Standard Model using jets. Dijet...

Source: http://arxiv.org/abs/1002.1708v2

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Sep 22, 2013
09/13

by
Shaohua Zhang

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In this Note, we try to study the relations between the Goldbach Conjecture and the least prime number in an arithmetic progression. We give a new weakened form of the Goldbach Conjecture. We prove that this weakened form and a weakened form of the Chowla Hypothesis imply that every sufficiently large even integer may be written as the sum of two distinct primes. R\'{e}sum\'{e} La conjecture de Goldbach et le plus petit nombre premier dans une progression arithm\'{e}tique Dans ce document, nous...

Source: http://arxiv.org/abs/0812.4610v7

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Sep 20, 2013
09/13

by
Ganquan Xie; Jianhua Li; Lee Xie; Feng Xie

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In this paper, we propose a novel GLWF double layer EM cloak in the broad frequency band. The GLWF double layer cloak consists of two sphere annular layers, two type cloak materials are proposed and installed in its each layer, respectively. The outer layer of the GL cloak has the invisible function in broad frequency band, while its inner layer has the fully absorption and rapid delay function. The GLWF double layer cloak overcomes the following difficulties of the single layer PS cloak. (1)...

Source: http://arxiv.org/abs/1002.4249v1

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Sep 20, 2013
09/13

by
Martin Lustig; Yoav Moriah

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In a previous paper we introduced a notion of "genericity" for countable sets of curves in the curve complex of a surface S, based on the Lebesgue measure on the space of projective measured laminations in S. With this definition we prove that for each fixed g > 1 the set of irreducible genus g Heegaard splittings of high distance is generic, in the set of all irreducible Heegaard splittings. Our definition of "genericity" is different and more intrinsic then the one...

Source: http://arxiv.org/abs/1002.4292v1

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Sep 19, 2013
09/13

by
Temo Vekua

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Low temperature dependence of specific heat of one- dimensional multicomponent systems at the commensurate- incommensurate phase transition point is studied. It is found that for canonical systems, with a fixed total number of particles, low temperature specific heat linearly depends on temperature with a diverging prefactor.

Source: http://arxiv.org/abs/0909.3862v2

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Sep 20, 2013
09/13

by
R. C. Bohlin

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Absolute flux distributions for seven solar analog stars are measured from 0.3 to 2.5 \mu m by HST spectrophotometry.In order to predict the longer wavelength mid-IR fluxes that are required for JWST calibration, the HST SEDs are fit with Castelli & Kurucz model atmospheres; and the results are compared with fits from the MARCS model grid. The rms residuals in 10 broad band bins are all

Source: http://arxiv.org/abs/1002.4381v1

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Sep 20, 2013
09/13

by
J. Ruseckas; B. Kaulakys

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We consider a class of nonlinear stochastic differential equations, giving the power-law behavior of the power spectral density in any desirably wide range of frequency. Such equations were obtained starting from the point process models of 1/f^b noise. In this article the power-law behavior of spectrum is derived directly from the stochastic differential equations, without using the point process models. The analysis reveals that the power spectrum may be represented as a sum of the Lorentzian...

Source: http://arxiv.org/abs/1002.4316v1

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Sep 20, 2013
09/13

by
The Fermi LAT Collaboration; Pulsar Timing Consortium

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We report on gamma-ray observations in the off-pulse window of the Vela pulsar PSR B0833-45, using 11 months of survey data from the Fermi Large Area Telescope (LAT). This pulsar is located in the 8 degree diameter Vela supernova remnant, which contains several regions of non-thermal emission detected in the radio, X-ray and gamma-ray bands. The gamma-ray emission detected by the LAT lies within one of these regions, the 2*3 degrees area south of the pulsar known as Vela-X. The LAT flux is...

Source: http://arxiv.org/abs/1002.4383v1

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Sep 20, 2013
09/13

by
Jonathan Dees; Robert Geisberger; Peter Sanders; Roland Bader

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Every human likes choices. But today's fast route planning algorithms usually compute just a single route between source and target. There are beginnings to compute alternative routes, but this topic has not been studied thoroughly. Often, the aspect of meaningful alternative routes is neglected from a human point of view. We fill in this gap by suggesting mathematical definitions for such routes. As a second contribution we propose heuristics to compute them, as this is NP-hard in general.

Source: http://arxiv.org/abs/1002.4330v1

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Sep 21, 2013
09/13

by
Gentaro Watanabe

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For systems described by the two-site Bose-Hubbard Hamiltonian, we show that a sinusoidal modulation of the tunneling matrix element assists higher-order co-tunneling processes. Using this mechanism, we propose an efficient new scheme for creating a coherent superposition of states in which all particles are either on one site or all on the other site, the so-called NOON state. This scheme yields an almost perfect NOON state periodically. For larger numbers of particles, further reduction of...

Source: http://arxiv.org/abs/0901.3850v3